The document discusses plenv and perl-build, tools for managing multiple Perl versions. It describes plenv's architecture where plenv invokes perl-build to install Perl versions. perl-build works by getting binary tarball URLs from various sources, but some of these sources like search.cpan.org will be retired, so the document recommends updating perl-build to version 1.20+ which will fetch URLs from the MetaCPAN API instead. It also mentions that the plenv and perlbrew developers work at LINE.

1. plenv and perl-build, and
search.cpan.org
Tokuhiro Matsuno
@LINE Corp

2. Which is the your preferred perl binary
manager?
Perlbrew or plenv?

3. Perlbrew developers and plenv
developers work at LINE.

4. plenv’s architecture
plenv invokes perl-build
plenv install 5.28.0
→ perl-build 5.28.0 ~/.plenv/versions/5.28.0

5. How perl-build works
Get binary tar ball URL from…
● CPAN::Perl::Releases
● http://perl-releases.s3-website-us-east-1.amazonaws.com/
● http://search.cpan.org/dist/perl-5.28.0

6. How perl-build works
Get binary tar ball URL from…
● CPAN::Perl::Releases
○ UPDATE REQUIRES re-fatpacking
● http://perl-releases.s3-website-us-east-1.amazonaws.com/
○ NOT UPDATED
● http://search.cpan.org/dist/perl-5.28.0
○ SCO WILL BE RETIRED

7. $ ./perl-build 5.28.0 /tmp/5.28.0
WARN: [cpan_perl_releases] not found the
tarball for perl-5.28.0
WARN: [perl_releases_page] This page is 3 or
more days old. ignore
WARN: [search_cpan_org] not found the tarball
for perl-5.28.0
ERROR: Cannot find the tarball for perl-5.28.0

8. Please update your perl-build to 1.20+
Get binary tar ball URL from…
● CPAN::Perl::Releases
○ UPDATE REQUIRES re-fatpacking
● CPAN::Perl::Releases::MetaCPAN
○ Fetching update information from MetaCPAN API

9. cd ~/.plenv/plugins/perl-build/ && git pull
How do I upgrade perl-build?

10. We’re hiring!